[tor-bugs] #18320 [Tor]: Clear old entries from the key-pinning journal file

[Tor Bug Tracker & Wiki]

#18320: Clear old entries from the key-pinning journal file
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     Reporter:  teor    |      Owner:
         Type:  defect  |     Status:  new
     Priority:  Medium  |  Milestone:  Tor: 0.2.7.x-final
    Component:  Tor     |    Version:
     Severity:  Normal  |   Keywords:
Actual Points:          |  Parent ID:  #17668
       Points:          |    Sponsor:
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 In the key-pinning-journal file, we accumulate duplicates over time as
 relays switch back and forth between two different ed25519 keys with the
 same rsa key. This has both the issue of exhausting dirauth disk space as
 well as making the involved data structure slow, if it happens a lot. We
 should prune duplicates when updating our latest view on a relay's
 identity mapping.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/18320>
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